At first, set an undecorated frame − , Now draw a border − , The following is an example to draw a border around an undecorated JFrame − ,

To set default button for JFrame, use the setDefaultButton() method − , The following is an example to set default button for JFrame − , On pressing the above button, the following is displayed on Console −

To get JFrame window size information, you can use the following − , For Screen Size − , For Frame Size − , The following is an example to get JFrame window size information − , ,

To select the second index, use the setSelectedIndex() method − , The following is an example to select the second index in Java JList − ,

To add background image to JFrame, use the getImage() method of the Image class − , Now, draw the image − , The following is an example to add Background Image to JFrame − ,

To create a JFrame with no border and title bar, use setUndecorated() − , The following is an example to create JFrame with no border and title bar − ,

To get directories from JFileChoose, use the mode setFileSelectionMode − , The following is an example to get Directories from JFileChooser − ,

To create FileFilter, use the FileNamExtensionFilter class. The following is an example to display File Type in JFileChooser − ,

This is a C++ program to generate all pairs of subsets, whose union make the Set. , , ,

This is a C++ program to generate all possible subsets with exactly k elements in each subset. , , ,